/// Copyright (c) 2019 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import UIKit
import RxSwift
import RxCocoa

class ViewController: UIViewController {
  @IBOutlet private var searchCityName: UITextField!
  @IBOutlet private var tempLabel: UILabel!
  @IBOutlet private var humidityLabel: UILabel!
  @IBOutlet private var iconLabel: UILabel!
  @IBOutlet private var cityNameLabel: UILabel!
  @IBOutlet private var tempSwitch: UISwitch!

  private let bag = DisposeBag()

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    style()

    ApiController.shared.currentWeather(city: "RxSwift")
      .observeOn(MainScheduler.instance)
      .subscribe(onNext: { data in
        self.tempLabel.text = "\(data.temperature)° C"
        self.iconLabel.text = data.icon
        self.humidityLabel.text = "\(data.humidity)%"
        self.cityNameLabel.text = data.cityName
      })
      .disposed(by: bag)

    let textSearch = searchCityName.rx.controlEvent(.editingDidEndOnExit).asObservable()
    let temperature = tempSwitch.rx.controlEvent(.valueChanged).asObservable()

    let search = Observable.merge(textSearch, temperature)
      .map { self.searchCityName.text ?? "" }
      .filter { !$0.isEmpty }
      .flatMapLatest { text in
        return ApiController.shared.currentWeather(city: text)
          .catchErrorJustReturn(ApiController.Weather.empty)
      }
      .asDriver(onErrorJustReturn: ApiController.Weather.empty)

    search
      .map { w in
        switch self.tempSwitch.isOn {
        case true:
          return "\(Int(Double(w.temperature) * 1.8 + 32))° F"
        case false:
          return "\(w.temperature)° C"
        }
      }
      .drive(tempLabel.rx.text)
      .disposed(by: bag)

    search.map { $0.icon }
      .drive(iconLabel.rx.text)
      .disposed(by: bag)

    search.map { "\($0.humidity)%" }
      .drive(humidityLabel.rx.text)
      .disposed(by: bag)

    search.map { $0.cityName }
      .drive(cityNameLabel.rx.text)
      .disposed(by: bag)
  }

  override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
  }

  override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    Appearance.applyBottomLine(to: searchCityName)
  }

  override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }

  // MARK: - Style

  private func style() {
    view.backgroundColor = UIColor.aztec
    searchCityName.textColor = UIColor.ufoGreen
    tempLabel.textColor = UIColor.cream
    humidityLabel.textColor = UIColor.cream
    iconLabel.textColor = UIColor.cream
    cityNameLabel.textColor = UIColor.cream
  }
}
